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How to force R to use a specified factor level as reference in a regression?

... See the relevel() function. Here is an example: set.seed(123) x <- rnorm(100) DF <- data.frame(x = x, y = 4 + (1.5*x) + rnorm(100, sd = 2), b = gl(5, 20)) head(DF) str(DF) m1 <- lm(y ~ x + b, data = DF) summary(m1) Now alter the factor ...
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How to add parameters to HttpURLConnection using POST using NameValuePair

I am trying to do POST with HttpURLConnection (I need to use it this way, can't use HttpPost ) and I'd like to add parameters to that connection such as ...
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What are some resources for getting started in operating system development? [closed]

...a lot of links after this brief overview of what is involved in writing an OS for the X86 platform. The link that appears to be most promising (www.nondot.org/sabre/os/articles) is no longer available, so you'll need to poke through the Archive.org version to read it. At the end of the day the boo...
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How to get a list of installed android applications and pick one to run

...ng with a server. Is there any guidelines? – dowjones123 Jun 30 '15 at 20:07 1 @dowjones123 Did u...
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C++ compiling on Windows and Linux: ifdef switch [duplicate]

... __OpenBSD__ Defined on OpenBSD __APPLE__ Defined on Mac OS X __hpux Defined on HP-UX __osf__ Defined on Tru64 UNIX (formerly DEC OSF1) __sgi Defined on Irix _AIX Defined on AIX _WIN32 Defined on Windows ...
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Failed to load the JNI shared Library (JDK)

... You need a 64-bit trio: 64-bit OS 64-bit Java 64-bit Eclipse share | improve this answer | follow | ...
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Why does multiprocessing use only a single core after I import numpy?

I am not sure whether this counts more as an OS issue, but I thought I would ask here in case anyone has some insight from the Python end of things. ...
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Is gcc's __attribute__((packed)) / #pragma pack unsafe?

...cked__)) my_struct { char c; int i; }; struct my_struct a = {'a', 123}; struct my_struct *b = &a; int c = a.i; int d = b->i; int *e __attribute__((aligned(1))) = &a.i; int *f = &a.i; Here, the type of a is a packed struct (as defined above). Similarly, b is a pointer to a p...
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POST request send json data java HttpUrlConnection

...wd"); auth.put("tenantName", "adm"); auth.put("passwordCredentials", cred.toString()); // <-- toString() parent.put("auth", auth.toString()); // <-- toString() OutputStreamWriter wr= new OutputStreamWriter(con.getOutputStream()); wr.write(parent.toString()); write JSONObject c...
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Does ARC support dispatch queues?

... And now for the long answer… If your deployment target is lower than iOS 6.0 or Mac OS X 10.8 You need to use dispatch_retain and dispatch_release on your queue. ARC does not manage them. If your deployment target is iOS 6.0 or Mac OS X 10.8 or later ARC will manage your queue for you. Yo...